I think the Flight Connection Centre (FCC) is now full operational at LHR
handles alot of connecting traffic..and I mean alot - for that reason alone I think the FCC should be up and running. If it was still closed today, then the airport terminals landside would be bursting at the seams!
Yesterday was just one of those exceptional days!
Also, the BAA website is still showing how to connect through the FCC at LHR
, so again it looks like it is operating normally.
Click below for details on how to connect at LHR
I hope this helps.